The rumors got started when Armstrong tagged both Weezer's Rivers Cuomo and Fall Out Boy bassist Pete Wentz in a comment on The Office actor Rainn Wilson's Sept. 6 Instagram post, as shown by Tone Deaf and echoed by the NME. But sleuthy fans soon discovered even more proof on a hidden Instagram account, as you can see in the video toward the bottom of this post.

While also uncovering the password-protected hellamegatour.com — which currently features a GIF of Wilson as The Office's Dwight Schrute doing a hushing motion — online investigators perhaps found their most damning documentation of the coming tour on the locked Instagram account @hellamegatour.

As reposted by multiple fans online, it was purportedly there that viewers came upon the below video of Armstrong refashioning Green Day's "Wake Me Up When September Ends" with the pertinent tagline, "Wake me up on September 10th." In the clip, Armstrong is seen wearing a white shirt emblazoned with "F.O.B." and the Weezer logo, alongside the words, "Hella Mega!" (Green Day drummer Tré Cool ends the clip by smashing the singer's guitar.) It's currently unclear exactly how the video was retrieved from a protected account.

On Twitter, others shared additionalevidence of the imminent concert tour. Will tomorrow, Sept. 10, be the day that Green Day announce their so-called "Hella Mega" jaunt with Weezer and Fall Out Boy?